Thursday, 18 August 2011

1)Piston pump

Construction:-
A Piston Pump is very similar in construction to a Reciprocating Internal Combustion Engine. The basic pumping action is obtained by reciprocation of a piston in a cylinder. The cylinder has two valves, one inlet and one outlet valve. And they allow for only inwards and outwards movement of the liquid respectively. These valves are situated in inlet and outlet manifold respectively. The piston is connected to a crankshaft through a connecting rod. The Piston Pump has a liner made of leather or any other synthetic material to provide proper sealing between the moving surfaces of the piston and the cylinder.            

Piston Pump - Working:-
The reciprocating action of the piston is obtained by crankshaft arrangement and guide path provided by the cylinder. The piston is connected to the crankshaft through the connecting rod which is coupled with the crankshaft through a revolute joint situated at some distance from the crankshaft axis. This distance can be called as crank length or the eccentric distance. It is this crank length which determines the stroke length of a piston pump.
The crankshaft is coupled to an electric motor or an engine shaft. As the crankshaft rotates the piston reciprocates. In one cycle of the crankshaft the piston reciprocates once, that is, moves one stroke forward and one backward. The intake and discharge of the liquid by a piston pump is basically the same as reciprocating pumps in general as discussed in previous article under working of reciprocating pumps.

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